JPH0797388B2 - Identification structure of the object - Google Patents

Identification structure of the object

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Publication number
JPH0797388B2
JPH0797388B2 JP4285270A JP28527092A JPH0797388B2 JP H0797388 B2 JPH0797388 B2 JP H0797388B2 JP 4285270 A JP4285270 A JP 4285270A JP 28527092 A JP28527092 A JP 28527092A JP H0797388 B2 JPH0797388 B2 JP H0797388B2
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JP
Japan
Prior art keywords
light
object
light receiving
identification
linearly polarized
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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JP4285270A
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Japanese (ja)
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JPH06111008A (en
Inventor
睦 佐々木
秀一 星野
逸雄 竹内
Original Assignee
日本発条株式会社
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Priority to JP4285270A priority Critical patent/JPH0797388B2/en
Publication of JPH06111008A publication Critical patent/JPH06111008A/en
Publication of JPH0797388B2 publication Critical patent/JPH0797388B2/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

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Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10821Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
    • G06K7/10831Arrangement of optical elements, e.g. lenses, mirrors, prisms
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00Holographic processes or apparatus using light, infra-red or ultra-violet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0252Laminate comprising a hologram layer
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00Holographic processes or apparatus using light, infra-red or ultra-violet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0272Substrate bearing the hologram
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/06009Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/08Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means
    • G06K19/10Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards
    • G06K19/16Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code using markings of different kinds or more than one marking of the same kind in the same record carrier, e.g. one marking being sensed by optical and the other by magnetic means at least one kind of marking being used for authentication, e.g. of credit or identity cards the marking being a hologram or diffraction grating
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00Holographic processes or apparatus using light, infra-red or ultra-violet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/0005Adaptation of holography to specific applications
    • G03H1/0011Adaptation of holography to specific applications for security or authentication
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00Holographic processes or apparatus using light, infra-red or ultra-violet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/024Hologram nature or properties
    • G03H1/0244Surface relief holograms
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2222/00Light sources or light beam properties
    • G03H2222/31Polarised light
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2240/00Hologram nature or properties
    • G03H2240/50Parameters or numerical values associated with holography, e.g. peel strength
    • G03H2240/55Thickness
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2250/00Laminate comprising a hologram layer
    • G03H2250/36Conform enhancement layer
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03HHOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2250/00Laminate comprising a hologram layer
    • G03H2250/41Polarisation active layer
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K2019/06215Aspects not covered by other subgroups
    • G06K2019/0629Holographic, diffractive or retroreflective recording

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【産業上の利用分野】本発明は対象物が正規の対象物であることを識別するための対象物の識別構造に関するものである。 The present invention relates is related to identification structure of the object to identify the object as an object of normal.

【0002】 [0002]

【従来の技術】従来から、磁気カードなどの情報記憶カード、各種有価証券、チケット若しくは一般に販売される商品などが正規のものであるか否かを判別するために、偽造することが困難なホログラムを識別シールとして各対象物に貼付し、目視により識別する構造が、例えば実開昭61−182580号公報に開示されている。 Heretofore, information storage cards such as magnetic cards, various securities, for such products sold in the ticket or generally it is determined whether or not legitimate, it is difficult to forge holograms It was attached to the object as identified seal structure identified visually is disclosed in JP Utility Model 61-182580.

【0003】また、本願出願人による特開平3−713 [0003] JP-A filed by the present applicant 3-713
83号公報には、対象物の表面に固有の回折特性を有するホログラムからなる識別シールを設け、光学的識別手段をもってこのホログラムに光を照射し、その回折光を受光して上記識別シール即ち対象物が正規のものであることを識別する構造が開示されている。 The 83 discloses, provided an identification seal comprising a hologram having a unique diffractive property to the surface of the object, light is irradiated to the hologram with the optical identification means, the identification seal or target by receiving the diffracted light things structure is disclosed for identifying that this is the normal.

【0004】特に、上記光学的識別手段を用いる構造によれば、見た目のみでなくその回折特性を正規のホログラムと同じようにする必要があることから偽造が困難であり、ある程度確実な識別を行うことができる。 In particular, according to the structure using the optical identification means, it is difficult to forge its diffraction properties not only looks it is necessary to do the same as the normal of the hologram is carried out to some extent reliable identification be able to.

【0005】しかしながら、このような構造の場合、ホログラムの回折特性に識別性をもたせていることが容易に解ることから、また例えば識別シール自体はその性質上容易に入手することが可能であることから、これを元に精密に偽造することは必ずしも不可能ではない。 However, in such structure, since it is easily understood that it has imparted the identity of the diffraction characteristics of the hologram, and for example, the identification seal itself can be easily obtained on the nature from, it is not always possible to precisely forge based on this. そのため、一層確実な識別構造が望まれていた。 Therefore, it has been desired a more reliable identification structure.

【0006】そこで、本発明者らは上記したような構造に於て反射方向特性(または回折特性)に加えて、直線偏波光を出射する光源と、その位相を180゜ずらして偏波面を90゜回転させるべく識別体に設けられた偏波面回転手段と、この偏波面が90゜回転した識別体からの出射光のみ受光する受光手段とを用い、偏波面の違いにより対象物が正規のものであることを識別すれば、一層確実に偽造を防止し得ることに思い至った。 [0006] Therefore, in addition to the reflection direction characteristic (or diffraction property) present inventors At a structure as described above, a light source for emitting linearly polarized light, the polarization plane of the phase likelihood 180 DEG 90 ° a polarization plane rotating means provided in the identification element to rotate, using a light receiving means for the polarization plane is received only light emitted from the identification element rotated 90 °, that the object is a regular due to differences in polarization if the identification that is, reached thought that may prevent more reliably forged. このとき、位相のずれが180゜前後に誤差を生じても受光側での受光強度はあまり変化しないことから、この受光強度のみから判断すると、元の光から確実に位相が180 At this time, since the phase shift is not received strength much change in even the light-receiving side occurs an error before and after 180 °, judging only from the received light intensity, reliable phase from the original light 180
゜ずれた光であるか否かの判別ができない。 DEG was unable judged whether or not it is light. 即ち、例えば位相をずらすための偏波面回転層をシールなどにより識別体に設け、位相のずれが180゜前後となるようにすることにより偽造が可能となる。 That is, for example, provided the polarization plane rotating layer for shifting the phase such by the identification seal type, the phase shift becomes possible forged by such a longitudinal 180 °. このような偽造はその組付時などの精度が比較的低いことから、これを防止するためには位相が確実に180゜ずれた光であるか否かの判別を行うと良い。 Since such forgery is relatively low accuracy, such as the time with the set, may in order to prevent this and discriminates whether a phase is surely 180 DEG light.

【0007】 [0007]

【発明が解決しようとする課題】このような従来技術の課題及び本発明者らの知見に鑑み、本発明の主な目的は、対象物に対する識別性が高く、かつ構造を解析して偽造することが困難な対象物の識別構造を提供することにある。 [Problems that the Invention is to Solve In view of the findings of the prior art problems and the present inventors, a primary object of the present invention, discrimination with respect to the object is high and forge analyzes the structure it is to provide an identification structure of a hard object.

【0008】 [0008]

【課題を解決するための手段】上述した目的は本発明によれば、特定波長の光を受光して或る点を中心に対称な複数の反射方向に出射すると共に光学的識別手段により Above object, according to an aspect of the according to the present invention, the optical identification means as well as outgoing symmetric multiple reflection direction about the point certain receives light of a specific wavelength
識別可能な固有の回折特性を有するホログラムまたは回 Hologram or diffraction having identifiable inherent diffraction characteristics
折格子からなる識別体を対象物に設け、前記識別体に向けて投光手段をもって検出光を照射し、その出射光を前記点を中心に対称な複数の受光面の対を有する受光手段をもって受光し、前記受光手段の受光状態から前記回折 Provided identifying objects comprising a diffraction grating on an object, said toward the identifying object by the detection light with the light projecting means, with a light receiving means having a pair of symmetrical plurality of light receiving surfaces about the point that the emitted light received light, the diffraction from the light receiving state of said light receiving means
特性を判断して前記対象物が正規の対象物であることを識別する対象物の識別構造であって、前記投光手段が、 And an identification structure of the object identifying that the object to determine the characteristics are object of regular, the light projecting means,
特定の波長であって、かつ特定の方向に偏波面を有する直線偏波光からなる検出光を前記識別体に向けて照射する手段からなり、前記識別体が、前記直線偏波光の偏波 A specific wavelength, and becomes the detection light comprising linearly polarized light having a polarization plane in a specific direction from the means for irradiating the identifying object, the identifying objects, polarization of the linearly polarized light
を複屈折により90°回転させる光学的異方体からなる偏波面回転層を有し、前記受光手段が、 前記偏波面の It has a polarization plane rotating layer made of optically anisotropic substance that the surface is rotated 90 ° due to the birefringence, the light receiving means, the polarization
90°回転した直線偏波光のみを透過するべく前記受光面の各対の一方に設けられた第1のフィルタと、 前記偏 A first filter provided on one of each pair of the light receiving surface so as to transmit only linearly polarized light rotated 90 °, the polarized
波面の回転していない直線偏波光のみを透過するべく前記受光面の各対の他方に設けられた第2のフィルタとを有し、前記第1のフィルタを介して前記対の一方に受光された光の強度と前記第2のフィルタを介して前記対の他方に受光された光の強度との比をもって前記各対の受光出力とし、該受光出力から前記対象物が正規の対象物であることを識別することを特徴とする対象物の識別構造を提供することにより達成される。 And a second filter provided on the other of each pair of the light receiving surface so as to transmit the linearly polarized light only not rotating wavefront, is received on one of said pair through said first filter and through the intensity of light said second filter with a ratio of the intensity of light received by the other of said pair and receiving the output of said each pair, the object from the light receiving output is a subject of normal It is accomplished by providing an identification structure of the object, characterized by identifying the. 特に、前記識別体 In particular, the identifying object
の前記回折特性を生じさせるホログラムまたは回折格子 Hologram or diffraction grating causes the diffraction characteristics of
の形成層が、前記特定波長の直線偏波光を複屈折により Layer formation, due to the birefringence of linearly polarized light of said specific wavelength
90°回転させる複屈折率の大きな材料からなる光学的 Optical consisting large material birefringence which rotates 90 °
異方体により形成されることにより、前記偏波面回転層 By being formed by anisotropic, the polarization plane rotating layer
を兼ねていると良い。 It may also serves as a.

【0009】 [0009]

【作用】このような構成によれば、光学的識別手段側から特定波長、かつ特定方向の直線偏波光を識別領域に向けて照射しなければ、受光部にてその出射光を受光できない。 SUMMARY OF According to this structure, unless irradiate the identification area a linearly polarized light of a specific wavelength and a specific direction from the optical identification means side, can not receive the light emitted by the light-receiving unit. 特に、対をなす受光面の一方に偏波面が回転した光を受光すると共に他方に偏波面が回転していない光を受光し、両者の比を受光出力とすることにより、光学的異方体からなる偏波面回転層による位相のずれ及び識別体の固有の回折特性が精度良く対応していないと正規の受光出力が殆ど得られない。 In particular, by polarization to the other while receiving light one polarization to the light receiving surface is rotated in a pair receives light does not rotate, and both the ratio of the light-receiving output, optical anisotropic substance When intrinsic diffraction characteristics of the phase shift due to the polarization plane rotating layer and identifying objects does not correspond accurately consisting receiving the output of the normal is not obtained almost. 従って、固有の回折特性を Thus, the inherent diffraction characteristics
有する識別体だけでなく偏波面回転層をも例えばシールとして偽造して識別体に張り付けた場合でも、正規の対称物を確実に識別できる。 Even when affixed to identifying objects spoofed as well for example sealed polarization plane rotating layer not only identifying objects having, reliably identify normal symmetry thereof. また、ホログラムまたは回折 In addition, the hologram or diffraction
格子の形成層に複屈折率の高い材料を用いてその厚みを The thickness using high birefringence material forming layer lattice
制御することで偏波面回転層を兼ねるようにすれば、従 If so also it serves as a polarization plane rotating layer by controlling, slave
来の層の構造との見分けが殆どつかないことから、この From the fact that distinguish between the structure of the layer of come almost no stick, this
部分が識別に用いられていることを判断することは一層 More able to determine that the portion is used to identify
困難であり、識別手段側を解析しなけれげ偏波面回転に It is difficult, under polarization plane rotation required to analyze the identification means side
よる識別構造を認識することができず、一層偽造防止効 It can not recognize the identification structure with, more anti-counterfeiting effect
果が高くなる。 Fruit is high. しかも層数が減って構造が簡単になり、 Moreover, the structure is simplified and reduced the number of layers,
製造も複雑化することがない。 There is no possibility that the manufacturing complex.

【0010】 [0010]

【実施例】以下、本発明の好適実施例を添付の図面について詳しく説明する。 BRIEF DESCRIPTION preferred embodiments the accompanying drawings in detail of the present invention.

【0011】図1〜図4は、本発明が磁気記憶カードに適用された例である。 [0011] FIGS. 1-4 are examples in which the present invention is applied to a magnetic storage card. 図1に示すように、カード1の表面1aには磁気ストライプ2が該カードの長手方向に延在している。 As shown in FIG. 1, a magnetic stripe 2 extends in the longitudinal direction of the card on the surface 1a of the card 1. また、表面1aには後記する固有の回折特性のホログラム層を有する識別体3が設けられている。 Further, the identification member 3 having a hologram layer of intrinsic diffraction characteristic to be described later is provided on the surface 1a.

【0012】一方、カード1用のリーダライタの内部には、図示されない搬送ユニットによりカード1が搬送されると上記磁気ストライプ2に対向する磁気ヘッド4が設けられている。 Meanwhile, inside the reader-writer for the card 1, the card 1 is conveyed magnetic head 4 facing the magnetic stripe 2 is provided by the transport unit (not shown). また、同様にしてカード1が搬送されると上記識別体3に対向する光学的識別手段としての投受光ユニット5が設けられている。 Further, when the card 1 is conveyed in the same manner as the light emitting and receiving unit 5 serving as optical identification means facing the identification element 3 is provided. この投受光ユニット5は、特定波長であって、かつ特定方向の直線偏波光からなるレーザ光を検出光としてカード1の表面1a上の識別体3に向けて照射するための発光素子6と、この発光素子6を囲繞する環状の受光素子8とを有している(図2)。 The light emitting and receiving unit 5 is a specific wavelength, and a light emitting element 6 for irradiating toward the identifying object 3 on the surface 1a of the card 1 with a laser beam comprising a specific direction of the linearly polarized light as the detection light, and an annular light receiving device 8 surrounding the light emitting device 6 (Figure 2). 受光素子7は、各々別々に受光可能な8つの部分7a〜7hに半径方向に区画された多分割フォトダイオードからなる。 The light receiving element 7 consists of a multi-segment photodiode which is divided radially into each separately receivable Eight parts 7a to 7h. また、この受光素子7は、公知のC Further, the light receiving element 7, a known C
PU、メモリ、I/F等から構成された判別ユニット8 PU, memory, judgment unit configured from the I / F, etc. 8
に接続され、カード1が正規のカードであるか否かを判別するようになっている。 It is connected to the card 1 is adapted to determine whether a legitimate card.

【0013】更に、図3に併せて示すように、受光素子7の部分7e〜7hの表面は上記特定方向の直線偏波光のみを透過する第1のフィルタ9aにより覆われ、部分7a〜7dの表面は上記特定の方向から90゜偏波面の回転した直線偏波光のみを透過する第2のフィルタ9b Furthermore, as also shown in FIG. 3, the surface of the portion 7e~7h of the light receiving element 7 is covered by a first filter 9a which transmits only the linearly polarized light in the specific direction, of the portion 7a~7d a second filter 9b surface that transmits only linearly polarized light rotated 90 ° polarization from the specific direction
により覆われている。 It is covered by. 尚、発光素子6、受光素子7と識別体3との間には対物レンズ10が介在している。 The objective lens 10 is interposed between the light-emitting element 6, the light receiving element 7 and the identification member 3.

【0014】他方、図4に示すように、識別体3はホログラム形成層11a及びその下層側の光反射層11bを有するホログラム層11と、このホログラム層11をカード1の表面1aに接着するための接着剤層12と、ホログラム層11の表面を覆う保護層13とを有している。 [0014] On the other hand, as shown in FIG. 4, the identification element 3 and the hologram layer 11 having the light reflecting layer 11b of the hologram forming layer 11a and the lower layer side thereof, for bonding the hologram layer 11 to the surface 1a of the card 1 and the adhesive layer 12, and a protective layer 13 covering the surface of the hologram layer 11. ここで、ホログラム形成層11aの材料として比較的複屈折の大きなポリ塩化ビニル(PVC)が用いられている。 Here, large polyvinylchloride relatively birefringent as the material of the hologram forming layer 11a (PVC) is used. また、このホログラム形成層11aの層厚は上記した発光素子6から照射されるレーザ光の波長の1/ The layer thickness of the hologram forming layer 11a is the wavelength of the laser beam emitted from the light emitting element 6 as described above 1 /
4にその複屈折量がなるように定められており、偏波面 As it has been defined as the birefringence amount is 4, polarization
回転層としても機能するようになっている And also it serves as a rotating layer. 従って、識別体3に入射したレーザ光はこのホログラム形成層11 Therefore, the laser light incident on the identifying object 3 the hologram forming layer 11
aを往復して透過することにより、位相の180°ずれた、即ち偏波面が90°回転した直線偏波光としてホログラムの回折特性に応じた方向に出射するようになる。 By transmitting back and forth a, 180 ° out of phase, i.e., polarization is to be emitted in a direction corresponding to the diffraction characteristics of the hologram as a linearly polarized light rotated 90 °.
尚、実際には延伸加工によりホログラム形成層11aは形成されている。 Actually, the hologram forming layer 11a by a stretching processing is formed.

【0015】次に本実施例の作動要領について説明する。 [0015] Next will be described operation procedure of this embodiment. 図3に示すように、識別体3と投受光ユニット5とが対向する位置にカード1が搬送されると、発光素子6 As shown in FIG. 3, when the card 1 is conveyed to a position where the identification element 3 and the light emitting and receiving unit 5 faces, the light-emitting element 6
から上記した特定波長であって、かつ特定の方向の直線偏波面を有する検出光が識別体3に向けて照射される。 A specific wavelength described above, and detection light having a linear polarization in a specific direction is irradiated toward the identifying object 3.
すると、ホログラム形成層11aにより複屈折し、光反射層11bにて反射した回折光が、入射光に対して偏波面が90゜回転された直線偏波光として、かつホログラムの回折特性に応じて発光素子6からの検出光の光軸を中心とする受光素子7の対称な2つの部分(部分7aと部分7e、部分7bと部分7f、部分7cと部分7g、 Then, birefringent by the hologram forming layers 11a, the diffracted light reflected by the light reflecting layer 11b is, as linearly polarized light polarization plane is rotated 90 degrees relative to the incident light, and in accordance with the diffraction characteristics of the hologram emission two symmetrical parts of the light receiving element 7 around the optical axis of the detection light from the element 6 (part 7a and the partial 7e, the portion 7b and a portion 7f, part 7c and a portion 7 g,
部分7dと部分7h)に向けて出射する。 It is emitted toward the part 7d and the portion 7h).

【0016】受光素子7の部分7e〜7hは上記特定方向に偏波面を有する光直線偏波光のみ透過する第1のフィルタ9aに覆われ、部分7a〜7dは上記特定の方向から90゜偏波面の回転した直線偏波光のみを透過する第2のフィルタ9bに覆われていることから、上記識別体からの出射光は部分7a〜7dのいずれかにのみ受光される。 The portion 7e~7h of the light receiving element 7 is covered with the first filter 9a which transmits only light linearly polarized light having a polarization plane in the specific direction, part 7a~7d 90 ° polarization from the specific direction since the covered rotated linearly polarized light only in a second filter 9b which transmits, light emitted from the identification element is received only one of the portions 7a to 7d. そして、判別ユニット8にて発光素子6を中心とする対称な部分同士の受光強度の比を求め、これを所定の閾値と比較し、或いは各比を比較して受光部分を判断して識別体3、即ち対称物としてのカード1が正規のものであるか否かを判別する。 Then, a ratio of the received light intensity of symmetrical parts with each other around the light-emitting element 6 at determination unit 8, which is compared with a predetermined threshold value, or to compare each ratio by the identification to determine the light receiving portion thereof 3, i.e., the card 1 as a symmetrical object is to determine whether it is legitimate.

【0017】ここで、例えば部分7aと部分7eとに向けて識別体3からの回折光が出射された場合、部分7a [0017] Here, if for example, the diffracted light from the identification element 3 towards the part 7a and the portion 7e is emitted, part 7a
と部分7eとの受光強度の差が大きくなる。 The difference in received light intensity between the portion 7e is increased. 即ち、元の位相から180゜ずれた位相の出力(部分7aの受光強度/部分7eの受光強度)は極めて大きくなる(図5)。 That is, (the received light intensity of the received light intensity / portion 7e portions 7a) output from the original phase 180 degrees from the phase becomes extremely large (Fig. 5). この出力値から判別を容易に行うことができる。 The determination of the output value can be easily performed.

【0018】このとき、例えばホログラム形成層11a [0018] At this time, for example a hologram forming layer 11a
に複屈折の大きな材料を使用していない識別体の表面に、位相をずらすための偏波面回転層を設けても同様なことが行えるため、偽造を目的としてシールなどにより識別体の表面に偏波面回転層を設けることが考えられる。 Polarized on the surface of the identifying objects that do not use a material having a large birefringence, because that allows Similar remarks provided polarization plane rotating layer for shifting the phase, forged to a surface such as by identifying objects sealing purposes in it is conceivable to provide a plane rotating layer. しかしながら、識別体3の回折特性と偏波面回転層の回転角度とが精度良く対応していないと、例えば部分7aと部分7eとに向けて識別体3からの回折光が出射された場合、部分7eの受光強度が大きくなると共に部分7aの受光強度が小さくなることから元の位相から1 However, if the diffractive property of the identification element 3 and the rotation angle of the polarization plane rotating layer do not correspond accurately, the diffracted light from the identification element 3 towards the example section 7a and the portion 7e is emitted, partial 7e 1 from the original phase because the received light intensity of the portion 7a is reduced with the received light intensity becomes large
80゜ずれた位相の出力が、正規な識別体に比較して急激に減少する。 80 DEG output of phase decreases drastically compared to the normal identification member. 従って、上記したような偽造を確実に発見でき、防止することができる。 Thus, can be reliably discover forged as described above, it can be prevented.

【0019】尚、本実施例ではホログラム形成層11a [0019] The hologram forming layer 11a in this embodiment
に複屈折の大きな材料を使用したが、保護層13に同様な材料を使用しても同様な効果が得られ、また、その材料としてセロハン、ポリビニルアルコール(PVA)、 Was used a material having a large birefringence, the same effect can be obtained even by using the same material in the protective layer 13, also cellophane as the material, polyvinyl alcohol (PVA), the
セルロースアセテート、ポリカーボネート等の材料を用い、その複屈折量が上記した照射光の波長の1/4となるように加工しても良い。 Cellulose acetate, a material such as polycarbonate, the birefringence amount may be processed to have a quarter of the wavelength of the irradiation light as described above.

【0020】 [0020]

【発明の効果】上記した説明により明らかなように、本発明による対象物の識別構造によれば、特定波長の直線偏波光を、点対称な複数の方向に反射すると共にその偏波面を90゜回転させる偏波面回転層を有する識別体を対象物に設け、この識別体に向けて上記直線偏波光を照射し、識別体からの出射光を、一方に90°回転した直線偏波光のみを透過する第1のフィルタが設けられ、他方に回転していない直線偏波光のみを透過する第2のフィルタが設けられた上記点対称な方向に対応する複数の受光面の対をもって受光し、上記受光面の対の一方に受光された光と他方に受光された光との強度比をもって対象物が正規の対象物であることを識別することにより、 As evidenced by the above description, according to the present invention, according to the identification structure of the object according to the invention, the linearly polarized light of a specific wavelength, the polarization plane by 90 ° as well as reflecting the point-symmetrical multiple directions provided an identification having a polarization plane rotating layer for rotating the object, toward the identifying object by irradiating the linearly polarized light, the emitted light from the identifying object, while the 90 ° rotated transmits only linearly polarized light first filter is provided, received with a plurality of light receiving surfaces of the pair of the second filter corresponding to the point symmetric directions provided that transmits only linearly polarized light that is not rotated in the other, the light receiving of by identifying the object as an object of regular with the intensity ratio of the light received by the light received and the other one of the pair of surfaces,
通常は偏波面回転による識別が行われていることを認識 Usually recognize that the identification by polarization plane rotation being performed
することは困難であり、また光学的異方体からなる偏波面回転層及び識別体の固有の回折特性精度良く対応していないと正規の受光出力が殆ど得られないことから Positive since it is difficult, also the inherent diffraction properties of the polarization plane rotating layer and identifying objects comprising the optically anisotropic material is not compatible accurately receiving the output of the normal is not obtained almost be
規の対称物を確実に識別できる。 The symmetry of the regulations can be reliably identified. ここで、識別体だけでなく偏波面回転層をも例えばシールとして偽造して識別体に張り付けた場合でも、両者を精度良く対応させることは困難である。 Here, even when stuck on identifying objects spoofed as well for example sealed polarization plane rotating layer not only identifying objects, it is difficult to accurately correspond to each other. また特に、偏波面回転層をホログラム Particularly, the holographic polarization plane rotating layer
形成層または回折格子の形成層で兼ねることにより、識 By also serve in forming layers or the formation of the diffraction grating layer, identification
別体に於ける偏波面の回転は通常使用される材料の層厚 The layer thickness of the material rotation normally used for in polarization separately
を定めるのみで行われることから、その構造が簡単にな Only from being performed in determining the, is it easy its structure
り、製造が容易になるばかりでなく、この部分が識別に Ri, not only manufacturing becomes easy to identify this part
用いられていることを判断することは一層困難であり、 It is more difficult to determine that it is used,
識別手段側を解析しなければ偏波面回転による識別構造 Identified by polarization rotation to be analyzing the identification means side structure
を認識することができず、一層偽造防止効果が高くな It can not be recognized, and it increases even more anti-counterfeit effect
る。 That.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】カード及び該カードが正規のカードであることを識別するための識別構造の要部構成斜視図である。 1 is a main part configuration perspective view of the identification structure for the card and the card to identify that it is a legitimate card.

【図2】投受光ユニットの平面図である。 FIG. 2 is a plan view of the light emitting and receiving unit.

【図3】投受光ユニットの側断面図である。 3 is a side sectional view of the light projecting and receiving units.

【図4】識別体の側断面図である。 4 is a side cross-sectional view of the identifying objects.

【図5】位相のずれと出力値(互いに対応する部分の受光強度の比)との関係を示すグラフである。 5 is a graph showing the relationship between the displacement and the output value of the phase (the ratio of the received light intensity of the corresponding portion to each other).

【符号の説明】 DESCRIPTION OF SYMBOLS

1 カード 1a 表面 2 磁気ストライプ 3 識別体 4 磁気ヘッド 5 投受光ユニット 6 発光素子 7 受光素子 7a〜7h 部分 8 判別ユニット 9a 第1のフィルタ 9b 第2のフィルタ 10 対物レンズ 11 ホログラム層 11a ホログラム形成層 11b 光反射層 12 接着剤層 13 保護層 1 card 1a surface 2 magnetic stripe 3 identifying object 4 the magnetic head 5 projecting light receiving unit 6 emitting element 7 receiving element 7a~7h portion 8 determines unit 9a first filter 9b second filter 10 objective lens 11 hologram layer 11a hologram forming layer 11b light reflection layer 12 adhesive layer 13 protective layer

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl. 6識別記号 庁内整理番号 FI 技術表示箇所 G06K 19/06 19/10 G06T 1/00 G07F 7/08 G06K 19/00 C R G07F 7/08 A (56)参考文献 特開 平3−71383(JP,A) 特開 昭62−275367(JP,A) 特開 昭64−88943(JP,A) ────────────────────────────────────────────────── ─── front page continued (51) Int.Cl. 6 identification symbol Agency Docket No. FI art display portion G06K 19/06 19/10 G06T 1/00 G07F 7/08 G06K 19/00 C R G07F 7/08 A (56) reference Patent Rights 3-71383 (JP, A) JP Akira 62-275367 (JP, A) JP Akira 64-88943 (JP, A)

Claims (2)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 特定波長の光を受光して或る点を中心に対称な複数の反射方向に出射すると共に光学的識別手 1. A optical identification hand with emitting symmetrical to multiple reflection direction about the point Ru some receives light of a specific wavelength
    段により識別可能な固有の回折特性を有するホログラム Hologram with a possible inherent diffraction characteristics identified by the step
    または回折格子からなる識別体を対象物に設け、前記識別体に向けて投光手段をもって検出光を照射し、その出射光を前記点を中心に対称な複数の受光面の対を有する受光手段をもって受光し、前記受光手段の受光状態から Or provided identifying objects comprising a diffraction grating on an object, said toward the identifying object by the detection light with the light projecting means, light receiving means having a pair of symmetrical plurality of light receiving surfaces about the point that the emitted light received with a, a light receiving state of said light receiving means
    前記回折特性を判断して前記対象物が正規の対象物であることを識別する対象物の識別構造であって、 前記投光手段が、特定の波長であって、かつ特定の方向に偏波面を有する直線偏波光からなる検出光を前記識別体に向けて照射する手段からなり、 前記識別体が、前記直線偏波光の偏波面を複屈折により90°回転させる光学的異方体からなる偏波面回転層を有し、 前記受光手段が、 前記偏波面の 90°回転した直線偏波光のみを透過するべく前記受光面の各対の一方に設けられた第1のフィルタと、 前記偏波面の回転していない直線偏波光のみを透渦するべく前記受光面の各対の他方に設けられた第2のフィルタとを有し、 前記第1のフィルタを介して前記対の一方に受光された光の強度と前記第2のフィルタを介して前記対の他方に And an identification structure of the object identifying that the object to determine the diffraction characteristics are object of regular, the light projecting means, polarization a particular wavelength, and in a specific direction It consists means for irradiating the detection light comprising linearly polarized light to the identification member having the identifying objects, comprising a polarization plane of the linearly polarized light from the optical anisotropic body rotated by 90 ° by the birefringent polarization has a plane rotating layer, said light receiving means, a first filter provided on one of each pair of the light receiving surface so as to transmit only linearly polarized light rotated 90 ° of the polarization plane, the polarization plane and a second filter provided only linearly polarized light that is not rotated in the other of each pair of the light receiving surface so as to Toruuzu was received in one of said pair through said first filter the other of said pair through the second filter and the intensity of light 光された光の強度との比をもって前記各対の受光出力とし、該受光出力から前記対象物が正規の対象物であることを識別することを特徴とする対象物の識別構造。 Identification structure of the object, characterized in that identifying the with the ratio of the intensity of the light light and a light receiving output of each pair, the object from the light receiving output is the object of the normal.
  2. 【請求項2】 前記識別体の前記回折特性を生じさせ Wherein causing the diffraction characteristics of the identifying objects
    るホログラムまたは回折格子の形成層が、前記特定波長 That hologram or formation of the diffraction grating layer, said specific wavelength
    の直線偏波光を複屈折により90°回転させる複屈折率 Birefringence rotated by 90 ° by the birefringence linearly polarized light
    の大きな材料からなる光学的異方体により形成されるこ This formed by an optical anisotropic body made of a material having a high
    とにより、前記偏波面回転層を兼ねていることを特徴とする請求項1に記載の対象物の識別構造。 Identification structure of the object of claim 1, and by, characterized in that it also serves as the polarization plane rotating layer.
JP4285270A 1992-09-29 1992-09-29 Identification structure of the object Expired - Lifetime JPH0797388B2 (en)

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JP4285270A JPH0797388B2 (en) 1992-09-29 1992-09-29 Identification structure of the object
US08/122,265 US5497227A (en) 1992-09-29 1993-08-16 System for determining the authenticity of an object
EP19930307235 EP0590826B1 (en) 1992-09-29 1993-09-14 System for identifying an object
DE1993619396 DE69319396D1 (en) 1992-09-29 1993-09-14 System for identifying an object
DE1993619396 DE69319396T2 (en) 1992-09-29 1993-09-14 System for identifying an object

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JPH0797388B2 true JPH0797388B2 (en) 1995-10-18

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DE69319396T2 (en) 1998-10-29
EP0590826B1 (en) 1998-07-01
US5497227A (en) 1996-03-05
JPH06111008A (en) 1994-04-22
EP0590826A3 (en) 1994-08-24
EP0590826A2 (en) 1994-04-06
DE69319396D1 (en) 1998-08-06

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